Decatur (IL)
July
Weather in Decatur, Illinois for July 2026
Your guide to Decatur weather in July - trends and predictions
So far, July 2026 in Decatur is slightly warmer than the historical average by 1.6 °C.
The forecast for the next days in Decatur predicts temperatures to be around 26 °C, close to the historical average.
In general, the average temperature in Decatur at the beginning of July is 29.3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 27.6 °C by the end of July.
Decatur experiences heavy rainfall in July, with over 20 rainy days and an average total precipitation 236.8 mm.
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Temperatures
Rain 🌧️
More
5
Dry days
26
Rainy days
0
Snow days
29°/20°
Temperatures
15 km/h
Avg max wind
81 %
Avg humidity
Decatur Weather July
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Temperatures trend during July in Decatur
See the weather trend as well as the moving average line
July weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jul. 1 |  Overcast | 28° /16° | 1.3 mm | 8 | |
| Jul. 2 |  Sunny | 30° /18° | 1 mm | 9 | |
| Jul. 3 |  Light rain shower | 32° /21° | 4 mm | 9 | |
| Jul. 4 | Light rain shower | 30° /21° | 8.5 mm | 8 | |
| Jul. 5 | Light rain shower | 29° /20° | 1.2 mm | 7 | |
| Jul. 6 |  Fog | 27° /18° | 9.7 mm | 7 | |
| Jul. 7 | Sunny | 29° /19° | 8.8 mm | 8 | |
| Jul. 8 | Light rain shower | 30° /18° | 4.2 mm | 8 | |
| Jul. 9 | Light rain shower | 27° /20° | 85.4 mm | 8 | |
| Jul. 10 | Fog | 29° /18° | 4.7 mm | 8 | |
| Jul. 11 | Patchy rain possible | 29° /20° | 8.2 mm | 7 | |
| Jul. 12 | Patchy rain possible | 30° /20° | 0.1 mm | 8 | |
| Jul. 13 |  Moderate or heavy rain with thunder | 29° /19° | 13.1 mm | 8 | |
| Jul. 14 |  Thundery outbreaks possible | 30° /20° | 0 mm | 8 | |
| Jul. 15 | Overcast | 31° /20° | 1.3 mm | 8 | |
| Jul. 16 |  Patchy light rain with thunder | 30° /21° | 1.4 mm | 8 | |
| Jul. 17 | Fog | 27° /20° | 3.5 mm | 8 | |
| Jul. 18 | Patchy rain possible | 27° /18° | 5 mm | 8 | |
| Jul. 19 | Patchy rain possible | 29° /18° | 0 mm | 8 | |
| Jul. 20 | Sunny | 33° /18° | 0 mm | 6.8 | |
| Jul. 21 | Sunny | 29° /20° | 3.6 mm | 9.2 | |
| Jul. 22 | Sunny | 23° /13° | 0.1 mm | 9.7 | |
| Jul. 23 | Sunny | 24° /13° | 0.6 mm | 9.2 | |
| Jul. 24 |  Light rain | 17° /15° | 36.8 mm | 5 | |
| Jul. 25 | Sunny | 25° /13° | 0 mm | 6 | |
| Jul. 26 | Sunny | 27° /17° | 0 mm | 7 | |
| Jul. 27 | Sunny | 28° /19° | 0.1 mm | 7 | |
| Jul. 28 | Mist | 31° /23° | 2.9 mm | 8 | |
| Jul. 29 | Sunny | 32° /24° | 0 mm | 8 | |
| Jul. 30 | Sunny | 28° /19° | 4.8 mm | 7 | |
| Jul. 31 | Sunny | 22° /14° | 0.7 mm | 5 | |
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Important Notice
Our weather forecast for Decatur in July is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Decatur forecast closer to your planned date for the most up-to-date weather information.
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Decatur in July - FAQ
What are the expected maximum and minimum temperatures in Decatur during July?
During July, expect a variety of temperatures with highs around 29° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Decatur during July?
Significant rainfall exceeding 236.8 mm is expected in Decatur during July, occurring over more than 26 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Decatur during July?
The average wind speed in Decatur during July is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
July rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs July weather 💧
Typically, Decatur has 26 rainy days in July with a total of 236.8 mm of rainfall.
UV exposure in Decatur during July
Stay informed about UV levels for safe outdoor activities throughout the month of July ☀️
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